#include"SeqList.h"

void SLInit(SL*ps)
{
	ps->arr = NULL;
	ps->size = ps->capacity = 0;

}

void SLDestroy(SL* ps)
{
	if (ps->arr)
		free(ps->arr);
	ps->arr = NULL;
	ps->size = ps->capacity = 0;
}

void SLCheckCapacity(SL* ps)
{
	if (ps->capacity == ps->size)
	{
		int newCapacity = ps->capacity == 0 ? 4 : 2 * ps->capacity;
		SLDataType* tmp = (SLDataType*)realloc(ps->arr, 2 *newCapacity * sizeof(SLDataType));
		if (tmp == NULL)
		{
			perror("realloc fail");
			exit(1);
		}
		ps->arr = tmp;
		ps->capacity = newCapacity;
	}
}
void SLPushBack(SL* ps, SLDataType x)
{	
	assert(ps);
	SLCheckCapacity(ps);

	ps->arr[ps->size++] = x;
}

void SLPrint(SL ps)
{
	for (int i = 0; i < ps.size; i++)
	{
		printf("%d ", ps.arr[i]);
	}
	printf("\n");
}

void SLPushFront(SL* ps, SLDataType x)
{	
	assert(ps);
	SLCheckCapacity(ps);
	for (int i = ps->size; i > 0; i--)
	{
		ps->arr[i] = ps->arr[i - 1];
	}
	ps->arr[0] = x;
	++ps->size;
}

void SLPopFront(SL* ps)
{
	assert(ps);
	assert(ps->size);

	for (int i = 0; i < ps->size - 1; i++)
	{
		ps->arr[i] = ps->arr[i + 1];
	}
	ps->size--;
}

void SLPopBack(SL* ps)
{
	assert(ps);
	assert(ps->size);
	--ps->size;
}